Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style

Teleosts exhibit extensive, ongoing neuroproliferation within their brains even as adults, which facilitates indeterminate growth and permits them to recover from injuries to their central nervous system which would be catastrophic in higher vertebrates. As a result, the brains of teleosts show cons...

Full description

Bibliographic Details
Main Author: Joyce, Brendan J.
Format: Thesis
Language:English
Published: 2022
Subjects:
Online Access:https://spectrum.library.concordia.ca/id/eprint/991831/
https://spectrum.library.concordia.ca/id/eprint/991831/1/Joyce_PhD_S2023.pdf
id ftconcordiauniv:oai:https://spectrum.library.concordia.ca:991831
record_format openpolar
spelling ftconcordiauniv:oai:https://spectrum.library.concordia.ca:991831 2023-07-16T03:57:33+02:00 Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style Joyce, Brendan J. 2022-12-14 text https://spectrum.library.concordia.ca/id/eprint/991831/ https://spectrum.library.concordia.ca/id/eprint/991831/1/Joyce_PhD_S2023.pdf en eng https://spectrum.library.concordia.ca/id/eprint/991831/1/Joyce_PhD_S2023.pdf Joyce, Brendan J. (2022) Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style. PhD thesis, Concordia University. term_access Thesis NonPeerReviewed 2022 ftconcordiauniv 2023-06-24T23:01:17Z Teleosts exhibit extensive, ongoing neuroproliferation within their brains even as adults, which facilitates indeterminate growth and permits them to recover from injuries to their central nervous system which would be catastrophic in higher vertebrates. As a result, the brains of teleosts show considerable phenotypically plasticity, adopting different morphologies in response to stimuli from the environment. This plasticity manifests as differential regional growth rates within the brain, with the balance between the rates of neuroproliferation and apoptosis determining if a region grows or shrinks. Their adaptive plasticity is constrained by the elevated metabolic cost of neural tissue, which penalizes excess investment in underutilized parts of the brain but also permits patterns of investment to change, leading to substantial intraspecific variation in brain morphology. The plasticity which leads to the morphological variation seen within species can exceed that seen between species and presents both obstacles to and opportunities for those who study teleosts or used them as model species. In this thesis, I set out to explore the potential ramifications of neuroplasticity in the teleost brain. I begin with a review of the literature (Chapter 1), identifying factors known to influence brain morphology and the predominant methods and model species used to measure it. In Chapter 2, I tested the impact of exposure to predation risk on the brain morphology of juvenile Atlantic salmon (Salmo salar) and adult northern redbelly dace (Chrosomus eos). I found that gross brain morphology can change in under 14 days of elevated predation risk. Chapter 3 expands on this, finding that predation pressure lead to smaller hypothalami and bolder individuals. I also demonstrate that hypothalamic size correlates with shyness (i.e. risk averse phenotypes). In Chapter 4, I used predation-induced brain morphology to test how olfactory and hypothalamic investment influence anti-predator behaviour in proactive and reactive ... Thesis Atlantic salmon Salmo salar Spectrum: Concordia University Research Repository (Montreal)
institution Open Polar
collection Spectrum: Concordia University Research Repository (Montreal)
op_collection_id ftconcordiauniv
language English
description Teleosts exhibit extensive, ongoing neuroproliferation within their brains even as adults, which facilitates indeterminate growth and permits them to recover from injuries to their central nervous system which would be catastrophic in higher vertebrates. As a result, the brains of teleosts show considerable phenotypically plasticity, adopting different morphologies in response to stimuli from the environment. This plasticity manifests as differential regional growth rates within the brain, with the balance between the rates of neuroproliferation and apoptosis determining if a region grows or shrinks. Their adaptive plasticity is constrained by the elevated metabolic cost of neural tissue, which penalizes excess investment in underutilized parts of the brain but also permits patterns of investment to change, leading to substantial intraspecific variation in brain morphology. The plasticity which leads to the morphological variation seen within species can exceed that seen between species and presents both obstacles to and opportunities for those who study teleosts or used them as model species. In this thesis, I set out to explore the potential ramifications of neuroplasticity in the teleost brain. I begin with a review of the literature (Chapter 1), identifying factors known to influence brain morphology and the predominant methods and model species used to measure it. In Chapter 2, I tested the impact of exposure to predation risk on the brain morphology of juvenile Atlantic salmon (Salmo salar) and adult northern redbelly dace (Chrosomus eos). I found that gross brain morphology can change in under 14 days of elevated predation risk. Chapter 3 expands on this, finding that predation pressure lead to smaller hypothalami and bolder individuals. I also demonstrate that hypothalamic size correlates with shyness (i.e. risk averse phenotypes). In Chapter 4, I used predation-induced brain morphology to test how olfactory and hypothalamic investment influence anti-predator behaviour in proactive and reactive ...
format Thesis
author Joyce, Brendan J.
spellingShingle Joyce, Brendan J.
Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style
author_facet Joyce, Brendan J.
author_sort Joyce, Brendan J.
title Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style
title_short Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style
title_full Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style
title_fullStr Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style
title_full_unstemmed Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style
title_sort phenotypic plasticity of the teleost brain: relationships between predation pressure, personality, and stress coping style
publishDate 2022
url https://spectrum.library.concordia.ca/id/eprint/991831/
https://spectrum.library.concordia.ca/id/eprint/991831/1/Joyce_PhD_S2023.pdf
genre Atlantic salmon
Salmo salar
genre_facet Atlantic salmon
Salmo salar
op_relation https://spectrum.library.concordia.ca/id/eprint/991831/1/Joyce_PhD_S2023.pdf
Joyce, Brendan J. (2022) Phenotypic Plasticity of the Teleost Brain: Relationships Between Predation Pressure, Personality, and Stress Coping Style. PhD thesis, Concordia University.
op_rights term_access
_version_ 1771544164758978560